Tool for rotating valve heads



R. E. BISSELL TOOL FOR ROTATING VALVE HEADS Dec. 11, 1928. 1,694,699

Filed Aug. 2, 1926 Pom/6,? OPERATED /0 {0M {0 hum m2.- I 14 M420 f 5/5551:

fiaz I W m Patented Dec. 11, 1928.

UNETE STARS 1,694,699 PATENT OFFICE.

RICHARD E. BISSELL, OF CLEVELAND HEIGHTS, OHIO, .ASSIGNOR TO THOMPSON PROD UCTS INO, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

TOOL FOR ROTATING VALVE HEADS.

Application filed August 2, 1928. Serial No. 128,352.

The invention relates to a tool adapted to engage a valve head of a special construction invented by me whereby it may be rotated for purposes of grinding.

Heretofore it has been difficult to grind tulip valves and cup valves without so forming them as to provide sharp points or edges which tend to cause prev-ignition, especially in high compression engines. In order to provide means for rotating a valve in its seat to grind the same I have provided the wall of a cavity in its upper face with a reentrant curve forming an annular recess in which my novel tool is adapted to engage for the purposes indicated, the valve features with which the novel tool cooperates forming the subject matter of an application filed concurrently herewith. I

The object of the invention is to effect the rotation of a valve head having no sharp points or edges, to grind the same in an effective way and by simple means.

The invention consists of the novel construction and combination. hereinafter described and claimed.

In the accompanying drawings showing a. preferred embodiment of my invention;

Figure. 1 is a side-elevation of my valvegrinding tool;

Fig. 2 is an end elevation thereof Fig. 3 is a fragmentary vertical section through a valve head with my valve-grinding tool shown in elevation in the position it occupies while in operation.

Fig. 4 is a. similar view taken at right angles to the position shown in Fig. 1, but showing a handle adapted to manually operate the tool.

Fig. 5 is a plan section taken on line V-V of Fig. 3.

Referring to the drawings in detail in which the same reference number is employed throughout to designate the same part, 1 designates a valve having a head 2 provided with a cavity 3 in its upper face, the wall of which has a reentrant curve forming an annular recess 4, and it is with such a. valve, or one having an annular recess 4, that the novel tool now to be described, is adapted to be used.

In the preferred embodiment of the invention shown in the drawings, the gripping members are formed from a plate of spring steel, bent midway its ends to form a loop 5, fro-1n which curve, downwardly and outwardly, two arms 6 and 7 these arms being separated at the point where they join the loop 5 a distance sufiiciently to permit them to spring inwardly toward each other, as in dicated in dotted lines, Fig. 1. The ends 8 of the arms are each preferably provided with a notch 9 to form sharp teeth 10, which are hardened sufliciently to bite into the material of the valve head in the annular recess 4. If a spring plate is selected of sufiicient hardness, special hardening of the teeth 10 will be unnecessary. A slot 11 is cut inthe loop 5, providing cars 12 adapted to receive a pin 13 loosely mounted therein for pivotal and lateral motion, as indicated in dotted lines, Fig. 2. A cross-pin 14 is mount ed in a transverse aperture of the pin 13, upon which is mounted a plate 15. As shown in the drawings, the cross-pin 14 is fixed in the pin 13 and the plate 15 is provided with apertured cars 16 loosely receiving the ends of the crosspin 14. But the cross-pin might be loosely mounted in the aperture of the pin 13 and be fixed in the ears 16. The plate 15 forms an engaging member by which the tool may be rotated either by manual or power means, while in gripping relation with the valve head. For manual operation it is preferred to use a handle member of well-known construction comprising a. shank 17 provided at its upper end with a hand-grip 18', and at its lower end with a head 19 having a slot 20 adapted to straddle the upper edge of the plate 15 to which it is pivotally secured by a cotter pin 21 passing through apertures in the head and plate. In well equipped shops, valve heads are turned for grinding by a power operated spindle; in such case plate 15 is engaged with such a. spindle in a manner similar to that indicated in the drawings.

It will be observed that the plate 15 is connected with the spring arms 6, 7 by a joint which permits not only universal motion, but a sliding motion in two directions at right angles to each other. Such a. connection is provided in order to accommodate the tool to a power operated spindle which may not be accurately alined with the axis of the valve head, thus permitting the valve head to be accurately turned in its seatwithout binding. WVhen manually operated, the valve head may be likewise accurately turned in its seat without the necessity of holding the handle in any particular position. It is obvious, therefore, that the specific connection of the power engaging means and the arms 6, 7 disclosed, is not absolutely necessary but may be varied, or one or more of the features dispensed with, in situations where such accommodation of the tool to the means to 1'0- tate it is not required.

The gripping member may be made in many forms other than that disclosed, it being essential only that the gripping ends be such as will permit them to enter the cavity in the head of the valve and be extended in gripping relation to the head. It is obvious therefore that the gripping members may be rigid members capable of inward and outward movement, that the ends may have any form which enables them to grip the valve head and transmit the motion of the power means thereto, and that gripping engagement may be effected by spring or other means.

It may be observed also that in the specific construction illustrated, the form of the arms is such that downward pressure upon them causes their ends to engage and grip the valve head more firmly and eii'ectively, but this is not an essential feature in all embodiments.

It is obvious that various changes may be made in the structure disclosed without 'departing from the priciples exemplified therein. It is therefore to be understood that my invention is not confined to the details described, but that it includes all changes and modifications falling within the appended claims.

hat I claim is:

1. A valve grinding tool comprising a fiat spring member looped at its centerportion with itsends curved downwardly and outwardly from the central loop to provide spring gripping members, a pin loosely connected with the loop for pivotal and sliding motion, and a plate mounted on the pin for pivotal and lateral motion in respect thereto. 2. A valve grinding tool comprising a flat spring member looped at its center port-ion with its end curved downwardly and outwardly from the central loop to provide spring gripping members, the free endsb eing provided with biting teeth, a slot in the loop providing apertured ears, a pin loosely mounted in the ears for pivotal and sliding motion, a, cross-pin of less diameter thanthc width of the slot mounted in the central portion of said pin beneath said ears, and a plate mounted on the cross-pin, the plate and crosspin having a pivotal and sliding motion with respect to the pin. I

3. As an article of manufacture, a valve grinding tool comprising diverging metal arms, the outermost extremities of Which are adapted to frictionally engage in a recess of a valve, and means including a universal connection associated with adj acent portions of said arms for rotating them, said arms when in use being at all times urged outwardly into tight engagement with substantially diametrically opposed portions of the valve head.

Signed by me this 23 day of July, 1926.

RICHARD E. BISSELL. 

